Replace it with one from a raptor660. Get the actual Yamaha part, not the Chinese Ebay knockoffs. Then youíll have an off setting. Just need to plug the vacuum line that goes to the stock carb.
I would still take the carb bowl off and clean out the Jets.
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.